How is Narcissism Diagnosed?

The term "narcissism" is rooted in Greek mythology, involving the tale of a young man named Narcissus who became so enamored by his own reflection in water that he fell in and drowned. Today, it's common to call someone "narcissistic" if they have certain personality traits: excessive self-confidence, an entitled sense of self, etc. So, how are psychologists defining it precisely? Is narcissism truly on the rise in today's world and, if so, why? Watch the video below to learn: